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2. X-linked genetic disease - Wikipedia

   en.wikipedia.org/wiki/X-linked_genetic_disease

   X-linked genetic disorders can arise when there is a spontaneous and permanent change in the DNA sequence of an X-linked gene, known as mutation. Traits or diseases caused by X chromosome genes follow X-linked inheritance, the difference between recessive and dominant inheritance affects the probability of an offspring acquiring it from the ...

3. Fragile X syndrome - Wikipedia

   en.wikipedia.org/wiki/Fragile_X_syndrome

   Location of the FMR1 gene on the X chromosome. Fragile X syndrome is a genetic disorder which occurs as a result of a mutation of the Fragile X Messenger Ribonucleoprotein 1 (FMR1) gene on the X chromosome, most commonly an increase in the number of CGG trinucleotide repeats in the 5' untranslated region of FMR1.

4. X-linked ichthyosis - Wikipedia

   en.wikipedia.org/wiki/X-linked_ichthyosis

   The STS gene is located on the X chromosome at band Xp22.3. Thus, the syndrome is an X-linked condition, and it affects males and females differently. The 23rd pair of chromosomes is typically termed the "sex chromosomes". Females have two X chromosomes and males have one X and one Y chromosome.

5. Genetic testing - Wikipedia

   en.wikipedia.org/wiki/Genetic_testing

   Genetic testing, also known as DNA testing, is used to identify changes in DNA sequence or chromosome structure. Genetic testing can also include measuring the results of genetic changes, such as RNA analysis as an output of gene expression, or through biochemical analysis to measure specific protein output. [1]

6. X-linked recessive inheritance - Wikipedia

   en.wikipedia.org/wiki/X-linked_recessive_inheritance

   X-linked recessive inheritance. X-linked recessive inheritance is a mode of inheritance in which a mutation in a gene on the X chromosome causes the phenotype to be always expressed in males (who are necessarily hemizygous for the gene mutation because they have one X and one Y chromosome) and in females who are homozygous for the gene mutation, see zygosity.

7. X-linked dominant inheritance - Wikipedia

   en.wikipedia.org/wiki/X-linked_dominant_inheritance

   As the X chromosome is one of the sex chromosomes (the other being the Y chromosome), X-linked inheritance is determined by the sex of the parent carrying a specific gene and can often seem complex. This is due to the fact that, typically, females have two copies of the X-chromosome, while males have only one copy.